I've never heard of the clutch lever pull effort increasing on these bikes, though I've heard its other issues described in a lot of different ways. Since everyone's description is based on feel, it's pretty hard to tell when two different descriptions are of the same problem, or when two different problems being described in a similar way.
The roughness is very common, but it's hard to say when it's just the slip&assist mechanism doing its thing, and when it's an actual service issue. Some have had their entire clutch replaced multiple times, others have been satisfied just by adjusting the cable to allow more play at the lever. I don't think there are any other adjustments that can be done to the clutch system, but others can correct me if there is something I'm missing.